Convoluted Fiber Pad

US 7,452,589 Term ended

Overview Sources & methods

Term ended Nov 18, 2019 · Medium confidence

Computed 20-year base term

Why Medium: A parent in the chain could not be resolved.

USPTO later recorded it as expired for non-payment on Dec 21, 2020.

Held by Fibrix, LLC

Filed Dec 22, 2005 as application 11/315,948 · Granted Nov 18, 2008

Base term plus 215 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer

Today

20 years from filing

Term ended Nov 18, 2019

1999 2026

Clock starts
Sep 28, 1999

Term ended
Nov 18, 2019

Granted
Nov 18, 2008

base term patent term adjustment after the term ends fee events Updated Nov 14, 2026 · includes USPTO assignment & status data published Nov 14, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know

215

Days of term adjustment

Read from the USPTO patent term adjustment record, not recalculated here.

Capped

Terminal disclaimer

Resolved from the filed document, referencing US 6,740,610.

2 of 2

Maintenance fees paid

Two maintenance fees can end this term early, the ones due 3.5 and 7.5 years from grant; the third one's grace period runs past the term end. This counts the ones the record shows paid.

How we calculated this date

One row per rule, each showing its own input and what it did to the date. A step we could not verify says so instead of resolving itself.

Step	Input	Date after this step	Confidence
Base term, 20 years from filing	Clock starts Sep 28, 1999, when the earliest non-provisional application in its chain was filed (this one was filed Dec 22, 2005); a parent in its chain could not be resolved (the next row)	Sep 28, 2019	High confidence
Continuity chain	A parent in the chain could not be resolved	dated from this application's own claim	Medium confidence
Patent term adjustment	+215 days, USPTO patent term adjustment record	Apr 30, 2020	High confidence
Terminal disclaimer cap	Disclaimer resolved from the filed document (refs US 6,740,610)	capped to Nov 18, 2019	High confidence
Patent term extension	None on file	no change	High confidence
Fee events	2 of 2 maintenance fees paid	term ended	High confidence
USPTO status record	Recorded as expired for non-payment on Dec 21, 2020, after the term ended	no change	High confidence
Computed term end	The steps above, in order	Nov 18, 2019	Medium confidence

Sources

Google Patents · The patent document at USPTO · Assignment records at USPTO

USPTO account required: This application in Patent Center · USPTO's maintenance fee lookup

Maintenance fee events come from USPTO's own fee records. Its fee lookup asks for the patent number and the application number.

Not on this page: the patent's family, its recorded assignments and its citation count. USPTO's assignment records, linked above, list every recorded assignment.

Every date shows its work: the base term, any term adjustment or extension, any disclaimer cap, and the maintenance fee record, each with a confidence tier. How this record was built

Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.

Convoluted Fiber Pad

Term ended Nov 18, 2019 · Medium confidence

20-year base term ended Sep 28, 2019

How we calculated this date

Sources